 In 1890 he went overland with South Australia's Governor, Lord Kintore, from Port Darwin to Adelaide and collected much flora and fauna including several specimens of the marsupial mole "Notoryctes typhlops", described and illustrated in his paper in the "Transactions and Proceedings" of the Royal Society of South Australia, 1891, p. 154.In 1893 he investigated at Lake Callabonna a remarkable deposit of fossil bones, and with A. H. C. Zietz reconstructed the complete skeleton of the enormous marsupial "Diprotodon australis" and partially reconstructed an immense wombat and a bird allied to the New Zealand moa.Also in 1893, Stirling and Zietz described five new species of Australian lizards.